/*
 * Copyright (C) 2010, Google Inc. and others
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Distribution License v. 1.0 which is available at
 * https://www.eclipse.org/org/documents/edl-v10.php.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

package org.eclipse.jgit.util;

Utility class for character functions on raw bytes

Characters are assumed to be 8-bit US-ASCII.
/**
 * Utility class for character functions on raw bytes
 * <p>
 * Characters are assumed to be 8-bit US-ASCII.
 */
public class RawCharUtil {
	private static final boolean[] WHITESPACE = new boolean[256];

	static {
		WHITESPACE['\r'] = true;
		WHITESPACE['\n'] = true;
		WHITESPACE['\t'] = true;
		WHITESPACE[' '] = true;
	}

	
Determine if an 8-bit US-ASCII encoded character is represents whitespace
Params:
c – 
           the 8-bit US-ASCII encoded character
Returns:
true if c represents a whitespace character in 8-bit US-ASCII/**
	 * Determine if an 8-bit US-ASCII encoded character is represents whitespace
	 *
	 * @param c
	 *            the 8-bit US-ASCII encoded character
	 * @return true if c represents a whitespace character in 8-bit US-ASCII
	 */
	public static boolean isWhitespace(byte c) {
		return WHITESPACE[c & 0xff];
	}

	
Returns the new end point for the byte array passed in after trimming any
trailing whitespace characters, as determined by the isWhitespace()
function. start and end are assumed to be within the bounds of raw.
Params:
raw – 
           the byte array containing the portion to trim whitespace for
start – 
           the start of the section of bytes
end – 
           the end of the section of bytes
Returns:
the new end point/**
	 * Returns the new end point for the byte array passed in after trimming any
	 * trailing whitespace characters, as determined by the isWhitespace()
	 * function. start and end are assumed to be within the bounds of raw.
	 *
	 * @param raw
	 *            the byte array containing the portion to trim whitespace for
	 * @param start
	 *            the start of the section of bytes
	 * @param end
	 *            the end of the section of bytes
	 * @return the new end point
	 */
	public static int trimTrailingWhitespace(byte[] raw, int start, int end) {
		int ptr = end - 1;
		while (start <= ptr && isWhitespace(raw[ptr]))
			ptr--;

		return ptr + 1;
	}

	
Returns the new start point for the byte array passed in after trimming
any leading whitespace characters, as determined by the isWhitespace()
function. start and end are assumed to be within the bounds of raw.
Params:
raw – 
           the byte array containing the portion to trim whitespace for
start – 
           the start of the section of bytes
end – 
           the end of the section of bytes
Returns:
the new start point/**
	 * Returns the new start point for the byte array passed in after trimming
	 * any leading whitespace characters, as determined by the isWhitespace()
	 * function. start and end are assumed to be within the bounds of raw.
	 *
	 * @param raw
	 *            the byte array containing the portion to trim whitespace for
	 * @param start
	 *            the start of the section of bytes
	 * @param end
	 *            the end of the section of bytes
	 * @return the new start point
	 */
	public static int trimLeadingWhitespace(byte[] raw, int start, int end) {
		while (start < end && isWhitespace(raw[start]))
			start++;

		return start;
	}

	private RawCharUtil() {
		// This will never be called
	}
}